. Evidence as to man's place in nature . most distinctly Simian pecu-liarities which the human organism exhibits. As to the convolutions, the brains of the apes exhibitevery stage of progress, from the almost smooth brain of theMarmoset, to the Orang and the Chimpanzee, which fall butlittle below Man. And it is most remarkable that, as soon asall the principal sulci appear, the pattern according to whichthey are arranged is identical with that of the correspondingsulci of man. The surface of the brain of a monkey exhibitsa sort of skeleton map of mans, and in the man-like apesthe details becom
. Evidence as to man's place in nature . most distinctly Simian pecu-liarities which the human organism exhibits. As to the convolutions, the brains of the apes exhibitevery stage of progress, from the almost smooth brain of theMarmoset, to the Orang and the Chimpanzee, which fall butlittle below Man. And it is most remarkable that, as soon asall the principal sulci appear, the pattern according to whichthey are arranged is identical with that of the correspondingsulci of man. The surface of the brain of a monkey exhibitsa sort of skeleton map of mans, and in the man-like apesthe details become more and more filled in, until it is only inminor characters, such as the greater excavation of the ante-rior lobes, the constant presence of fissures usually absent inman, and the different disposition and proportions of someconvolutions, that the Chimpanzees or the Orangs brain canbe structurally distinguished from Mans. * See the note at the end of this essay for a succinct history of the controversyto which allusion is here Chimpanzee. Fig. 22.—Drawings of the cerebral hemispheres of a Man and of a Chim-panzee of the same length, in order to show the relative proportions of theparts : the former taken from a specimen, which Mr. Flower, Conseiwator of theMuseum of the Royal College of Surgeons, was good enough to dissect for me ;the latter, from the photograph of a similarly dissected Chimpanzees brain, givenin Ml. Marshalls paper above referred to. a, posterior lobe; h, lateral ventricle;c, posterior comu; x, the hippocampus minor 102 So far as cerebral structure goes, therefore, it is clear thatMan differs less from the Chimpanzee or the Orang, thanthese do even from the Monkeys, and that the differencebetween the brains of the Chimpanzee and of Man is almostinsignificant, when compared with that between the Chim-panzee brain and that of a Lemur. It must not be overlooked, however, that there is a verystriking difference in absolute mass and weight between thelo
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